Compilation in iTunes shows up multiple times in iPod list

macrumors newbie

Hi,
I have a compilation in iTunes containing a thousand or so 'singles' (individual songs, not really part of any album). It is called 'My Library'. No problem there, however, in my iPod this compilation appear 4 times with the same name (My Library) AND containing 4 times the same thousand songs. The compilation art thumbnails are random but different in all 4 entries and 3 times the 'artist' is 'Various Artists' (as it should be), one time it is 'Roger Waters'. How is that possible and how can I fix this?

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